Spark transmitter



June 21, 194 9. H. BENIOFF 2,473,780

' SPARK TRANSMITTER Filed- Oct. 5, 1945 2 Sheets-Sheet 1 lNVE/VTOR Huso BENIOFF June 21,1949, H. BENIOFF 2,473,780

SPARK TRANSMITTER Filed octfs, 1945 2 Sheets-Sheet 2 FIG. 2

Patented June 21, 1949 trifiiaiiiis. I.

The- .present invention reiateato an vuitrahigir trequency electromagnetic transmittingrdevice of the spark type-and has for its-.purposemean'srfor more effectively andefiiciently radiating electromagnetic. energy bymeans eta sparkecircuite The present invention may appl-y both to 4111- rective andenom-directive transmissiom andincludes in its v arrangement atransflor'mer man evacuated container positioned. in the s'amenassembly with the rest oflthe: ecnii'prnent. Iii this way it is possible to make all .of, theeieads-short and-provide a compact smaii.light-wekhtdvice in arsingle unit. H v A The. arrangement will. be mercifully described in connection with the drawings illustrating ran.

embodiment of the. invention in whi'ch Fig. 1" shows a pIa-n View of the devi'ce Figez shows-a sectional view on the line ZQ-iof. but slightly, enlarged; and Fig. 3 shows aesectioneon the line 3-3 of Fig.,2l

In the arrangement iridicatediirthaflgures the unit may be enclosed. in a. metallic. housing or box I which may be of spun .aluminnm' if desired, which is ciosedtbyiaicovei: preferably transparent for theifradiation v.of ,.eIecti'omagnetic.

energy. Any' suitable inat'eri'allihay teiise'ci for this purpose as,,for .i steneegetrensperem plastic known as "Plexiglas," Btween fli oveinand a flange 3' of the housing I there issupbt'irted a I instance, brass, c'o' 'per or-theli'li e Themeuiitihg plate 4"is held between fihefl'ange ioflthe "housing I and a corresponding.,fiaiige .5"'fdrnied as the rim of the cover 2;

Suitable clamping" rings 6 and 1; Sfifiting'lgoiten the" cover 2 and 1' fitting over the flangewitn" appropriate mounting gaskets a ena ybrififith sides of the brass plate, may be used to ti'oldithe assembly firmly in place Whefi st'z'retiflsf and 'II positioned around the erieiiery offtfi' reusing and eoverrespec'tively' arepui' iii lace.

The mountiii'gi'plate 4' supports the entire structure within the casing: Eiz'tendi'rigifitidithe housing" I is a large" bowI-Iikemefliber I2 may be a copper spinning or other trim riieteitie structure; This preierably permanentrgg; at tached by welding"; silver' s'oldef or" otherwise, indicated by the numeral I3, around] t dgepof the member I 2" to an" offsetsectiori' lff'at -lilie'ffiiier edge of the plate 4 whienisianiiul'ar iasiiapee The copper-spun bowl'niay', ifdesir'ed, be made in two parts with a lower pIate-IiKeLmemBerrIB attached to. the member I'Zin a. soft solderriii joint I6 if desired. Supported iati ,the. .cehfier,.of

2 flange I'I- of the plate is the-fiacuuin impulse transformer I 8 which will-he described-iinwdetail later. This also is mountedtathe flange ,IT'By means of a soft-solder .joint 19 0i some cemparatively lower temperature melting solder.

I Mounted within-ether opening in, the plate is the antenna and spark electrode assembly. comprises aeplate 26 with an extending-flange I which. fits .inar shoulder iziformed on site face-wot the-ofisetM around theiopeniligeto the plate 4e A lgro u'p o'f'smailrscfrews Z3. used to hold the plateimsecurl'yiinpiacee The-flak 20- has also. aidownyvardlly extending flanged-24 adjacent the flangefi At the end r? this flange there are sueise tea a group of insu latingrbars orfingers igiiitr'idihg inwardlywhicham fastened t'o-the flange il by means of screws 26. Theelments' maybe made of. any suitable. insulating rmeteii' i ease for instance,,Myca1ex. Supported by thijfi'n is 25 is the lower disk i'lw'c hich, fat-the center the sparking electrode 2'8. is mounted. Thedfske 21 may be held to' the M'y'ca'iex terserbraekefeby means of the screws 29'.-- 'ifieiippi plate iiird sk opposite to the disk" 21 is ifidicatedatfsfl T15 isformed as a part of .theplate 20 by-eitendihg the lowersuiieee of thiplfate inward; thankme the. plate thicker at the 'xitrai iegien. l'Ifhe plate mend its ii'tfidiiigsfiijss in'in a'yi fthe same material as thepiate 2'1 ids anee, stainless st er or other fic'jfi-cdffbdibl' metal. The plate 30 is provideuiwitn a Heie .31 1: cash which the red 32 extends, end ofwmeHus fli'ze'd in the state 21'. Th s fodibiiiis read to the antenna arm 33 atfiee eaat the end. of the rod 32. A11 of these material's.fflay be (if stainless StTO'fi' dfififi'dtiV metal. The other arm if'is siipeerred iiy phe feeder 35 rigidiy monster in plate an; The antenna, as ineieetea; is a hammer in wnieh fihe length from the I x'itflfia .tihs' retires-parkin points is suester i auy the same; see er-t ng f0! 0116 .arxri 34 bifig Shgfifilji 16h? "'tri'airi the armaa. Aneiectroae fi'isifidiiiitii islfate an opposite the eieetre ere s28: rhesetweereetrodes extend beyond the edjaeenrsurfaees-ref the plates-s30 and 21,.respectiveiy, an ere-senewhat narrowed. at then-ends, Between fifielnds of. the electrodes triereis pes tie'r iedgaifiiea,se rator s1 whieiiis supficfted' in menses" 2&1

Tha impulse transformer. Lis- 1 shell .31 preferabiyof grass. Th gla's'ssli formed with awQyHQidIiEBSL- efid uss I rounded end in which atiiick seetienmisie the plate I5 by meansbfla downWardly.-extend-:=- 55. carrying. a central-support II on iwl'iiliaiidim 42 is supported carrying a secondary winding 43. The supporting rod 4| may be of conductive material and one end 44 of the winding 43 may be attached to the rod While the other end 45 of the winding may be connected to the terminal electrode 46 passing through the glass shell of the tube and sealed in the side boss 41. This terminal 46 may also provide an electrical connection and support for the primary winding 48, the other end it of which is connected by means of conductive rod 50 to the terminal sealed to the tube in the boss 52. The primary winding 48 surrounds and is concentric with the secondary winding 43.

Connection is made betweenthe terminal at the external end of the rod 4! and the electrode 28 by means of a spring conducting element 53.:

The transformer windings 43 and 48 are supported in position in the evacuated shell 37'. The shell itself is provided with a metallized band 5-:

. which is joined to the flange i! in the plate l5 by means of the soft-solder joint I9.

In the assembly of the device the impulse transformer and its mounting support, including the member [2, are supported by means of the annular plate 4. The spark electrode system and the antennae may then be mounted in place as a unit on the annular plate 4, the spring 53 furnishing the contact pressure with the electrode 28. The insulating separator which provides a hole between the sparking electrodes 28 and 38 insures a discharge in that enclosed area. The antenna is such that it is resonant because of its dimensions at the desired frequency. The ratio of turns in the impulse transformer makes it possible to use externally a lower voltage for connection to the device since the voltage is stepped up within the unit itself.

It will also be noted that the chamber formed within the cover 2 and the plate 4 and well I2 is entirely sealed from the external atmosphere so that this space may be either partially evacuated or filled with gas as may be desired. Suitable vent plugs 55 and 56 are provided for this purpose.

Having now described my invention, I claim:

1. An ultra high frequency spark transmitter comprising a doublet antenna, a pair of opposed capacitive plates having central electrodes, means supporting the arms of the doublet from said opposed capacitive plates, a vacuum-enclosed impulse transformer having primary and secondary windings and means directly connecting the terminal of one end of the secondary to one of said electrodes.

2. An ultra high frequency spark transmitting system including a doublet antenna, an oscillatory spark circuit having opposed capacitive plates with centrally opposed electrodes and a vacuum enclosed impulse transformer, means supporting the impulse transformer in close position to said plates, means providing a direct electrical connection from one of said electrodes to the secondary of said impulse transformer, and means supporting the arms of the doublet from said opposed plates.

3. An ultra high frequency spark transmitting system including a doublet antenna, an oscillatory spark system having opposed capacitive plates I with centrally opposed electrodes, a vacuum immeans for elements of said vacuum impulse transformer, and means supporting the arms of the doublet from said opposed plates.

4. An ultra high frequency spark transmitting system including an annular plate member, an oscillatory spark circuit having opposed capacitive plates, one of said capacitive plates having an outwardly extending ring with a transversely extending 'fiange, means attached to said flange for supporting the other capacitive plate, antennae elements and means supporting said antennae elements directly to said capacitive plates, and means for mounting the spark circuit to said annular plate member, whereby said spark circuit may be mounted as a unitary structure on said annular plate.

5. An ultra high frequency spark transmitting system including an annular plate member, an oscillatory spark circuit having opposed capacitive plates, one of said capacitive plates having an outwardly extending ring with a transversely extending flange, means attached to said flange for supporting the other capacitive plate, antennae elements and means supporting said antennae elements directly to said capacitive plates, and means for mounting the spark circuit to said annular plate member, whereby said spark circuit may be mounted as a unitary structure on said annular plate, and a vacuum enclosed impulse transformer having a connecting member aligned with one of said electrodes, means supporting said impulse transformer from said annular plate and spring means making contact between said connecting members and said one electrode.

6. An ultra high frequency spark transmitting system including an oscillatory spark circuit comprising an annular mounting member, a pair of capacitive plates positioned in opposed relation and supported by said mounting member, a pair of antenna arms, a pair of conductive supports, one for each antenna arm supporting said arms to said plates, said plates having centrally positioned electrodes and one of said supports passing through a hole in the capacitive plate to which it is not supported.

7. An ultra high frequency spark transmitting system including an oscillatory spark circuit comprising an annular mounting member, a pair of capacitive plates positioned in opposed relation and supported by said mounting member, a pair of antenna arms, a pair of conductive supports, one for each antenna arm supporting said arms to said plates, said plates having centrally positioned electrodes and one of said supports passing through a hole in the capacitive plate to which it is not supported, the electrical length from the antenna tips to the electrodes being substantially the same.

8. An ultra high frequency spark transmitter comprising a doublet antenna, an oscillatory spark circuit having opposed capacitive plates with opposed electrodes and an impulse transformer connected at its secondary winding to at least one of said plates, and means supporting the arms of the doublet from said opposed plates, the electrical length from the tip of each arm to the electrode on the supporting plate being substantially the same.

9. An ultra high frequency spark transmitting system comprising an annular mounting plate 'having a bowl peripherally mounted at one side thereof around the opening therein, said bowl having at its base another opening concentric with the mounting plate opening, an oscillatory circuit having opposed capacitive plates, means for mounting said plates on said mounting plate in the opening therein, antenna elements, means for supporting said antenna elements directly to said plates while maintaining said elements disposed on the other side of said mounting plate from said bowl, an impulse transformer, means mounting said transformer in said other opening in said bowl, a direct connector within the bowl from the secondary winding of said transformer to one of said capacitive plates, and means disposed outside said bowl for making connection to the primary winding of said transformer.

10. An ultra high frequency spark transmitting system comprising an annular mountin plate having a bowl peripherally mounted at one side thereof around the opening therein, said bowl having at its base another opening concentrio with the mounting plate opening, an oscillatory circuit having opposed capacitive plates, means for mounting said plates on said mounting plate in the opening therein, antenna elements, means for supporting said antenna elements directly to said plates while maintaining said elements disposed on the other side of said mounting plate from said bowl, an impulse transformer, means mounting said transformer in said other opening in said bowl, a direct connector within the bowl from the secondary winding of said transformer to one of said capacitive plates, means disposed outside the bowl for making connection to the primary winding of said transformer, and means mounted on the outer periphery of said mounting plate for hermetically enclosing the entire structure, the enclosure on the antenna side of the mounting plate being transparent to radiation of said antenna elements.

11. An ultra high frequency spark transmitting device comprising an annular mounting base, a bowl peripherall mounted on one side of said base around the opening therein, said bowl having an aperture at its bottom, an oscillatory circuit including opposed capacitive plates, confronting spark electrodes on said plates, means for mounting said plates in said opening, an impulse transformer, means mounting said transformer in said aperture, a direct connection within the bowl from the secondary winding of said transformer to one of said plates, and means disposed outside of said bowl for making connection to the primary winding of said transformer.

HUGO BENIOFF.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 833,034 De Forest Oct. 9, 1906 897,279 Fessenden Sept. 1, 1908 974,762 Fessenden Nov. 1, 1910 1,628,569 Worthington May 10, 1927 1,633,047 St. James June 21, 1927 1,802,371 Bullivant et a1. Apr. 28, 1931 1,962,796 Wappler June 12, 1934 2,068,712 Rypinski Jan. 26, 1937 2,240,941 Ohl May 6, 1941 2,287,845 Varian et a1 June 30, 1942 2,313,513 Brown Mar. 9, 1943 2,407,245 Beniofi Sept. 10, 1946 2,410,087 Litton Oct. 29, 1946 2,413,187 McCurdy Dec. 24, 1946 2,413,195 Schwager Dec. 24, 1946 FOREIGN PATENTS Number Country Date 647,365 France Nov. 23, 1928 509,160 Germany Sept. 25, 1930 Certificate of Correction Patent No. 2,473,780. June 21, 1949.

HUGO BEN IOFF It is hereby certified that error appears in the printed specification of the above numbered patent requiring correctlon as follows:

Column 4, line 34, claim 5, for the Word members read member;

and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Ofiice.

Signed and sealed this 29th day of November, A. D. 1949.

THOMAS F. MURPHY,

Assistant C'ommz'ssz'oner 0 f Patents.

Certificate of Correction Patent N 0. 2,473,780. June 21, 1949. HUGO BENIOFF It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows:

Column 4, line 34, claim 5, for the Word members read member;

and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 29th day of November, A. D. 1949.

THOMAS F. MURPHY,

Assistant Commissioner of Patents. 

